SANTA MONICA—Construction on the 405 northbound will result in the closure of the freeway from midnight on Monday to about 5 a.m. Tuesday morning. Although this is an overnight task, officials are still advising commuters to take alternate routes.

The work on the 405 is part of an improvement project which involves widening and making repairs to the freeway. Overnight closures began over the weekend and resulted in traffic back up, especially on Saturday, May 18.

The work on the 405 has resulted in the building of new onramps and offramps as well as the HOV lane on the northbound 405. Officials expect the project to be completed in its entirety come mid-2014.